Dedusting apparatus



Aug. 15, 1933. H. BRELSFORD 1,922,075

DEDUSTING APPARATUS Filed April 20, 1931 2 Sheets-Sheet l W l2. INVENTORA'rry erv/s/ard BY W ATTORNEYS 1933- H. E. BRELSFORD 1,922,075

DEDUSTING APPARATUS Filed April 20, 1931 2 Sheets-Sheet 2 INVENTORATTORNEYS Patented Aug. 15, 1933 LUNlTEi) STATS ICE DEDUSTING APPARATUSApplication April 20, 1931. Serial No. 531,571

18 Claims.

This invention relates to an apparatus for removing dust and otherobjectionable elements from a stream of flowing gas and has particularreference to an apparatus of this character in which wetted elements areplaced in the path of gas flow for separating the dust and otherobjectionable elements from the gas.

One of the primary objects of this invention is to provide means forevenly distributing the water or other liquid over the surfaces of theelements arranged in the path of gas flow.

A further object of this invention is to provide means for periodicallyflushing the surfaces of the elements to maintain these surfaces wet andto periodically wash the dust or the like from the same. The inventionfurther contemplates the provision of a construction in which the wateror other liquid used for wetting the surfaces of the elements will notbe blown through the de-dusting apparatus and contem plates further theprovision of a construction by which the frequency of the flushing ofthe elements and the amount of liquid flowed over the surfaces of theelements may be readily con trolled.

Numerous other objects and advantages of this invention will become moreapparent the following description proceeds, particularly when referenceis had to the accompanying drawings, wherein:

Fig. 1 is an elevational view of a de-dusting apparatus constructed inaccordance with the teachings of this invention, this apparatus beingshown in position in a gas passage;

Fig. 2 is a vertical sectional view through de-dusting apparatus shownin Fig. l

Fig. 3 is a horizontal sectional view taken substantially on the line3-3 of Fig. 2;

Fi l is an enlarged sectional view through a 4.0 portion of thestructure shown in Fig. 2;

i Fig. 5 is a view similar to Fig. 2 showing a slightly modified form ofconstruction;

Fig. 6 is a horizontal sectional view through the device shown in Fig.'5;

Fig. '7 is an enlarged elevational view of a portion of the structureshown in Fig. 5;

ig. 8 is a fragmentary elevational view showing a further modified formof construction; and

Fig. 9 is a semi-diagrammatic View with parts broken away showing afurther application of the inventive idea.

the

Referring then more particularly to the dravw ings wherein likereference characters designate is shown in Fig. l

- sired manner within the casing but are preferreceive the waste gasesfrom a furnace or any other dust originating apparatus (not shown) andadapted to conduct this gas to the atmosphere or to any other point ofdischarge. Arranged intermediate the ends of this passage is a device 11adapted to remove the dust and other objectionable elements from thegas, prior to its discharge from the passage.

The device 11 may he of any general construction in so far as itincludes one or more elements arranged in the path of gas flov, togetherwith means for wetting the surfaces of these elements. Thus, byreference to Figs. 2 and 3 of the drawings, it will be noted that thedevice may include a casing 12 having inlet and outlet ends connected toadjacent portions of the gas passage 16. The casing is provided with asloping lower wall 13 for directing the dust laden liquid to a dischargepipe i l and is provided adjacent its top with a, tank 15 adapted to besupplied with water or any other dust collectin liquid as by the pipe16;

Arranged within the casing 12 in the path of the gas flow therethroughare a plurality of elements 20. These elements may he of any desiredcross sectional shape and are shown, by way of illustration, in Fig. 3of the drawings as being substantially diamond shaped in cross section.Further, these eleme ts be arranged any deably arranged in transverserows 21, the elements in each row being staggered relative to theelements in the next adjacent rows.

For the purpose of wetting the outer surfaces of these elements, eachelement be provided adjacent its upper end with a recess22, the upperedge of the element defining the top of the recess being serrated asdesignated by the reference character 23. A nozzle pipe 24 eX- tendsdownwardly, a substantial distance into each recess for dischargingliquid intothe same, the arrangement being such that when the recess isoverfiowed, the liquid will run downwardly over the exteriorsurfaces ofthe element to wet the same.

The present invention contemplates means for causing the liquid to flowover the surfaces of the elements in a series of waves and each nozzlepipe 24: is terefore extended upwardly through the tank 15 sothat itsinlet end 25 is placed in communication with the atmosphere. Within thetank each ncsalepipe is provided with one or more openings 26 throughwhich the liquid in the tank may flow for discharge into the recess '22.It will be noted that the openings '26 are spaced. 110

JOVG the floor of the tank so that the same will not be clogged by dirtorthe like collecting in the bottom of the tank.

By this arrangement air will be entrained. with the liquid in the nozzlepipe 24 and a mixture of air and water will be discharged into eachrecess 22. The air being discharged into the recess 22 at a substantialdistance below the level of the liquid therein will bubble upwardlythrough the liquid and create a considerable disturbance over the entiresurface of the liquid. This disturbance or boiling of the liquid willcause the same to flow intermittently between the teeth of the serratededge 23 of the bafile element with the result that the liquid will flowintermittently or in waves down the sides of the element. Generally, theentire surface of the liquid will be disturbed by the bubbling of theair up through the liquid and the liquid will be discharged evenly fromthe top of the recess and distributed evenly over the sides of theelement. However, any other distribution of the liquid may be effectedas desired by properly controlling the disturbance of the liquid by theair.

As brought out before, the shape of the elements within the de-dustercasing may be varied at will. Thus, in place of the elements ofsubstantial thickness above described, plate-like elements 30, such asshown in Figs. 5 and 6 of the drawings, may be arranged within thecasing. These elements are preferably arranged in transverse rows 31,the elements of each row being staggered relative to the elements of thenext adjacent rows so that the gas flowing through the casing is dividedinto a number of relatively fine bands.

For the purpose of wetting the outer surfaces of these plate-likeelements, a plurality of nozzle pipes 32 are associated with eachelement, these .nozzle pipes having their lower discharge ends 33arranged adjacent the upper edge of the element, as clearly shown inFig. 7 of the drawings. Each nozzle pipe extends into the liquid tank15' and is provided with an inlet end 34 in communication with theatmosphere and an inlet port 35 through which liquid may flow from thetank 15. Thus a mixture'of air and water will be discharged from eachnozzle pipe adjacent the top of its respective element.

With this arrangement the dust collecting liquid will be intermittentlydischarged from each nozzle pipe, the air entrained with the liquidcausing this intermittent discharge. Thus the dust collecting liquidwill be flowed down the sides of the elements in a series of waves withthe result that the surfaces of the elements will be continuously wettedbut will be periodically,

flushed by the liquid. As in the first described form of construction,this flushing of the surfaces of the elements effects a washing of thedust and other objectionable elements from the same.

If desired, mechanical means may be provided for effecting anintermittent discharge of the dust collecting liquid over the surfacesof the elements. Such a means is shown in Fig. 8 of the drawings and byreference to this figure, it will be noted that each discharge pipe 40is con- ...nected to the bottom wall of the liquid tank 15''.

A valve 41 within the tank is adapted to close the end of the nozzlepipe 40 to prevent the flow of liquid from the tank through this pipeand a valve stem 42 is connected to this valve for operating the same.To reciprocate the valve stem and thus periodically open and close thevalve, there is provided a shaft 43 which may be rotated in any desiredmanner. Fixed to this shaft is a disk 44 provided with a cam groove 45adapted to receive a roller 46 journaled on the end of the valve stem.Thus, as the shaft 43 is rotated the valve stem 42 will be verticallyreciprocated and the valve 41 will be periodically opened and closed toeffect an intermittent supply of liquid from the tank 15 to the pipe 40.It will be understood that the pipe 40 might be associated with thebaiiie element shown in Fig. 4 of the drawings or with the bafiieelement shown in Fig. 7. If the pipe 40 is arranged to discharge thedust collecting liquid into a reservoir or recess at the top of thebaffle element in the manner illustrated in Fig. 4, then theintermittent supply of liquid to this recess will effect aninintermittent overflow of the liquid from the recess as will be readilyapparent. If, on the other hand, the pipe 40 is arranged to dischargethe dust collecting liquid directly against the outer surface of anelement in the manner disclosed in Fig. '7, then the intermittent supplyof liquid to the pipe will effect an intermittent flow of the dustcollecting liquid down the sides of the element as will be readilyapparent.

The mechanical means for effecting an intermittent flow of the dustcollecting liquid has particular advantages when it is desired toregulate the quantity of liquid flowed over the surfaces of the elementsor the periods of flushing of the elements. Thus, as diagrammaticallyillustrated in Fig. 9 of the drawings, with the elements arranged inrows 50 transversely of the de-duster casing, the shafts43 may be sorotated and the cam disks 44' so arranged on these shafts that the rowsof baffle elements will be flushed in sequence. Thus the baffle elementsin row 50 may be flushed slightly in advance of the baffle elements inrow 50 and these latter may be flushed slightly in advance of theelements in row 50 Further, the speed of rotation of the shafts may bevaried so that the elements in one row will be flushed with lessfrequency than the elements in another row, with the result thatcertainrows of the elements will be wetted to a lesser extent than theelements in other rows. This latter provision eliminates the danger ofthe dust collecting liquid being blown through the de-duster casing bythe force of the gas being c eaned, since, while the elements in row 50may be frequently flushed and thus wetted to a con siderable extent, theelements in rows 50 and 50 may be less frequently wetted and may thuscollect any dust collecting liquid blown off of the elements 50 Further,if desired, certain of the rows of elements'adjacent the discharge endof the casing may be maintained free from the dust collecting liquid andbeing thus substantially dry, will collect any moisture blown off of thepreceding elements in the casing. Thus the arrangement might be suchthat no dust collecting liquid would be supplied to the elements in rows50 with the result that any liquid blown from the rows 50 50 or 50 wouldbe collected by the elements in rows 50 From the above it is believedthat the invention will be clearly apparent. Means is provided foreffecting an intermittent flow of a dust collecting liquid over thesurfaces of the elements arranged in the path of the gas flow and thisintermittent flow of the liquid maintains the surfaces wet and alsoperiodically flushes the sur faces to wash the dust and the liketherefrom. The intermittent flow may be effected by the en trainment or"air or any other gas with the dust collecting liquid or may he eiiectedby mechanically acti ,ting a valve w ch controls the flow of liquid tothe surfaces. urther, the flowing of the liquid in waves orintermittently will effect a thorough wettin of the surfaces without,however, so flooding the surfaces that the liquid will be blown from thesame.

While several forms of the invention have been disclose and described,it is to be understood that the right is reserved to make all suchchanges in the details and arrangement of parts as will fall within thepurview of the attached claims.

What I claim as my invention is:

1. In combination, a gas passage, an element in said passage in the pathof the gas flow therethrough, and continuously operating means foreffecting a wave-like flow of a dust collecting liquid over saidelement.

2. In combination, a gas passage, an element in said gas passage in thepath of the gas flow therethrough, a source of dust collecting liquid,and means for causing the liquid from said source to flow over saidelement in a series of waves.

3. In combination, a gas passage, an element in said gas passage in thepath of the gas flow therethough, and means for supplying a liquid tothe surface of said element to wet the same, including means forintroducing a gas into said liquid to cause the liquid to flow over thesurface of said element in a series of waves.

4. In combination, a gas passage, an element in said passage in the pathof the gas flow therethrough, and means includng a nozzle pipe forflowing a liquid over said element to wet the same, including means forentraining air with the liquid in said nozzle pipe to cause the liquidto flow in waves over said element.

5. In combination, a gas passage, an element in passage in the path ofthe gas flow there through, and means for intermittently flowing aliquid over said element to wet the same, said means including a liquidtank and a nozzle pipe extending into said tank, said nozzle pipe havingits discharge end adjacent element and its inlet end open to theatmosphere, said nozzle pipe being also provided with an openingintermediate its ends constituting an inlet for the liquid in said tank.I

6. In combination, a gas passage, an element in said passage in the pathof the gas flow there through, a nozzle pipe having a discharge endadjacent said element, and means operating to intermittently supply aliquid to said nozzle pipe for discharge therefrom on to said element tocause the liquid to flow over said element in a series of WEJJGS.

7. In combination, a an element in said passage in the of the gas flowtherethrough, said element being provided with a recess adjacent itsupper end, means for supplying a liquid to recess, and means causing theliquid in said to flow therefrom in a series of waves dowui re sides or"said element.

8. In combination, a gas passage, an element in said passage in the pathof the gas flow therethrough, said element being provided with a recessadjacent its upper end, and means for supplying a liquid to said recessand for discharging a gas into liquid to cause the same to bubble overthe edge of said recess and flow down the sides of said element.

9. In combination, a gas passage, an element in said passage in the pathof the gas flow therethrough, said element being provided with a recessadjacent its upper end, and means for filling said recess with a liquidand for causing the said liquid to intermittently flow over the edges ofsaid recess and down the sides of said element, said means including aliquid tank, and a nozzle pipe having its discharge end in said recessadjacent the lower end thereof and having its inlet end in communicationwith the atmosphere, said nozzle pipe being also provided with anopening intermediate its ends constituting an inlet for the liquid insaid tank.

10. In combination, a gas passage, an element in said passage in thepath of the gas flow therethrough, said element being provided with arecess adjacent its upper end, and means for supplying a liquid to saidrecess and for periodically causing the same to overflow said recess towet the sides of said element, said means including a liquid dischargepipe extending into said recess, and means for admitting a gas to saidnozzle pipe for discharge into said recess.

11. In combination, a gas passage, an element in said passage in thepath of the gas flow therethrough, and means for effecting a flow of aliquid over the surfaces of said element in a series of waves, saidmeans including a liquid discharge pipe, and a valve for controlling theflow of liquid through said pipe.

12. In combination, a gas passage, an element in said passage in thepath of the gas flow there through, and means for effecting a flow of aliquid over the surfaces of said element in a series of waves, saidmeans, including a liquid discharge pipe, a valve for controlling theflow of a liquid into said discharge pipe, and means for periodicallyactuating said valve.

13. In combination, a gas passage, an element in said passage in thepath of the gas flow therethrough, and means for intermittently wettingthe surfaces of said element, said means including a liquid dischargepipe, a valve for controlling the flow of a liquid through said pipe, astem connected to said valve, a rotatable shaft, a disk carried by saidshaft and having a cam groove, and a roller on said stem engageable' insaid cam groove whereby upon rotation of said shaft said stem isreciprocated to intermittently open and close said valve.

14. In combination, a gas passage, a plurality of elements arranged inrows transversely of said gas passage, means for wetting the surfaces ofsaid elements, and means operating to flush the surfaces of saidelements according to a predetermined desired sequence.

15. In combination, a gas passage, a plurality of elements arranged inrows transversely of said gas passage, and means operating tointermittently flush the surfaces of the said elements to wet the sameand to wash the dust and other objectionable elements from the same,said means being operable to flush the elements in each row in advanceof the elements of the next adjacent row in the direction of gas flowthrough the said passage.

16. In combination, a gas passage, an element in said passage in thepath of the gas flow therethrough, and means for intermittently flowinga liquid over said element to wet the same, said means including aliquid tank above said element, and a nozzle pipe extending into saidtank through the floor thereof, said nozzle pipe having its dischargeend adjacent said element and havmaintain a series of waves of a liquidon the surfaces of said element.

18. In combination, a gas passage, an element in said passage in thepath of the gas flow therethrough, and means operating to maintain aflow of a liquid over said element in the form of a series of waves.

HARRY E. BRELSFORD.

